"amira ali" wrote in message <kfs5n7$i5j$1@newscl01ah.mathworks.com>...> dlmwrite(str3, sift_arr,'delimiter',' ','-append','precision',7);> size(sift_arr) is 1000*263> > so i want to write first 263 columns in first row then write second 263 column in second row ..........> > how can i do that> any help?????????????